e_kobz's FP 71HTA stock block/head/cam Evo IX - 450/400 on E85 @ 31psi
Dec 31, 2014, 01:19 PM
#1
e_kobz's FP 71HTA stock block/head/cam Evo IX - 450/400 on E85 @ 31psi
I finally got around to getting my Evo IX retuned this morning before my NASA track day next weekend. My friend Tony Szirka of UMS Tuning was responsible for the tune via his Dynapack.
For those who haven't been following my last thread, I had my Evo IX tuned back in the beginning of October before the last event on the NASA 2014 schedule. The car made 382/397 on E85 at 29psi. The car was a beast but I knew the stock BOV was holding me back as it was leaking above 26psi. I ended up searching this forum for a aftermarket upgraded BOV and I found a Cobb DV for sale from a reputable member on here. Shortly after picking that up Forced Performance put up their "name your price" sale. So I picked up a 71HTA CHRA at a killer price. Then two weeks later FP put another sale on their Race manifolds, so of course I just had to pick that up too.
Fast forward to today. All the mods used during my tuning session are in my signature below. The first coupe pulls were getting the new turbo and DV dialed in. The Cobb DV holds boost like crazy, no leaks of any kind, and it goes without saying that the FP 71HTA spools like crazy. We did experience a lot of surging between 3000 and 4000rpm. Because of this we made the boost come on slower, eventually i'll pick up a anti-surge housing in hopes of eliminating it. As I said the turbo just wanted to spool. On the first couple pulls the turbo was hitting 33/34 psi, much higher than where I wanted it. We took it down to 30/31 psi and left it there. The car produced 450whp and 400wtq at 31psi. The only issue we ran into was running out of fuel. I have a Walbro 255 and FIC 1120's and managed to hit 100% IDC. I feel both the injectors and fuel pump are capable of hitting 500whp, I just need to figure out what's holding me back, but for now i'll just enjoy the new power. I know this may sound crazy but I'm still on the stock headstuds. I have a set of ARP's and will eventually do them when I do cams. Trying to decide between S1's and S2's. All in all I am extremely pleased with the ending results, the car is a absolute beast. The FP 71HTA is one badass little turbo.
Things to note:
All tuning/pulls were done in 4th gear
AFR's were at 12.0
Still on stock headstuds
For those who haven't been following my last thread, I had my Evo IX tuned back in the beginning of October before the last event on the NASA 2014 schedule. The car made 382/397 on E85 at 29psi. The car was a beast but I knew the stock BOV was holding me back as it was leaking above 26psi. I ended up searching this forum for a aftermarket upgraded BOV and I found a Cobb DV for sale from a reputable member on here. Shortly after picking that up Forced Performance put up their "name your price" sale. So I picked up a 71HTA CHRA at a killer price. Then two weeks later FP put another sale on their Race manifolds, so of course I just had to pick that up too.
Fast forward to today. All the mods used during my tuning session are in my signature below. The first coupe pulls were getting the new turbo and DV dialed in. The Cobb DV holds boost like crazy, no leaks of any kind, and it goes without saying that the FP 71HTA spools like crazy. We did experience a lot of surging between 3000 and 4000rpm. Because of this we made the boost come on slower, eventually i'll pick up a anti-surge housing in hopes of eliminating it. As I said the turbo just wanted to spool. On the first couple pulls the turbo was hitting 33/34 psi, much higher than where I wanted it. We took it down to 30/31 psi and left it there. The car produced 450whp and 400wtq at 31psi. The only issue we ran into was running out of fuel. I have a Walbro 255 and FIC 1120's and managed to hit 100% IDC. I feel both the injectors and fuel pump are capable of hitting 500whp, I just need to figure out what's holding me back, but for now i'll just enjoy the new power. I know this may sound crazy but I'm still on the stock headstuds. I have a set of ARP's and will eventually do them when I do cams. Trying to decide between S1's and S2's. All in all I am extremely pleased with the ending results, the car is a absolute beast. The FP 71HTA is one badass little turbo.
Things to note:
All tuning/pulls were done in 4th gear
AFR's were at 12.0
Still on stock headstuds
Last edited by e_kobz; Jan 21, 2016 at 09:15 AM.
Dec 31, 2014, 02:05 PM
#2
EvoM Guru
iTrader: (1)
Very nice. What boost control are you running?
Dec 31, 2014, 02:15 PM
#4
EvoM Guru
iTrader: (1)
Did you guys try to hold any more boost out the top?
Dec 31, 2014, 03:01 PM
#7
Yeah i'm probably gonna switch to FIC 1450cc's. And yeah I know S2's are good. I'm just looking for the ultimate response with the broadest power band. I road race my car, it rarely sees street time. That's why I was considering S1's
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Dec 31, 2014, 04:12 PM
#9
Great looking powerband.
What WGA and how many turns of preload?
+1. S2 cams (+ springs) are awesome, especially on an Evo 9.
I don't think your issue is the 1120 cc/min injectors. I made 490 whp on FIC1100s at similar boost levels. I think the issue is that your fuel pump is getting tired, or maybe the fuel filter is getting clogged. Suggest that rather than going to FIC1450s (which are more challenging than the average injector to dial in), you install a Walbro 450. Its an awesome pump, and assuming that your fuel filter isn't getting clogged, I think it will take care of your fuelling issue.
The latest S2 variant is amazing in what it does for power. When I switched from HKS cams to S2s, the boost threshold was slightly earlier, and I picked up 20 whp.
What WGA and how many turns of preload?
The latest S2 variant is amazing in what it does for power. When I switched from HKS cams to S2s, the boost threshold was slightly earlier, and I picked up 20 whp.
